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村井 宏隆, 片山 直
セッションID: PS-01
発行日: 2007年
公開日: 2008/06/25
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フリー
ESTELITE PROの色について、明度よりも彩度、特に歯の黄色みを主とした色調選択が色の調和の取れた修復が可能になると思われた。
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山下 大輔, 神原 賢治, 町頭 三保, 宮本 元治, 佐藤 秀夫, 野口 和行, 和泉 雄一, 伴 清治
セッションID: PS-02
発行日: 2007年
公開日: 2008/06/25
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フリー
ジルコニアセラミックスは高強度セラミックス材料として、歯科応用されつつある。本研究はインプラント材料としての可能性を検討するため、ジルコニアセラミックス表面への骨芽細胞様細胞 (MC3T3-E1)を用いた生体適合性について検討した
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熊谷 崇, 穴田 貴久, 島内 英俊, 鈴木 治
セッションID: PS-03
発行日: 2007年
公開日: 2008/06/25
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フリー
The present study was designed to investigate whether the hydrolysis of octacalcium phosphate (OCP) affects the release of beta-lactoglobulin (beta-Lg) adsorbed on OCP and its hydrolyzed apatitic products (OCP hydrolyzates). The release of beta-Lg at pH 4.0 tended to be inhibited with the advancement of hydrolysis from OCP into apatite. The previous studies reported that OCP can be converted to apatite and is subjected to osteoclastic resorption when implanted in bone. The tendency of the protein desorption from OCP and its hydrolyztaes at acidic pH suggests that these calcium phosphates may be used as carrier of cytokines in bone tissue engineering by OCP.
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堤 祐介, 高野 陽如, 土居 壽, 野田 和彦, 塙 隆夫
セッションID: PS-04
発行日: 2007年
公開日: 2008/06/25
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フリー
擬似体液中でのジルコニウムの腐食挙動に対するパラジウムと白金添加の影響について調査した。また熱処理による組織変化の影響も同様に調べた。
この結果、パラジウムも白金も耐食性向上に効果的であることがわかった。これはジルコニウムの選択溶解に伴う不動態皮膜の性質や、皮膜直下の金属相の組成が変化したためであると考えられ、合金添加に伴い腐食電位が大幅に上昇したことからも支持される。またこのことはXPS分析によって明らかにされた。
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服部 修明, 鈴木 崇弘, 神野 悟史, 桶屋 洋之, 石川 温子, 近藤 千裕, 林 達秀, 伊藤 正満, 金森 孝雄, 河合 逹志, 野 ...
セッションID: PS-05
発行日: 2007年
公開日: 2008/06/25
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フリー
Methyl methacrylate (MMA) has been a useful material in dentistry and medicine, because of its excellent formability and operability. We have already found out that the toxin response genes such as glutathione S-transferases (GSTs) and NAD(P)H:quinone oxidoreductase 1 (NQO1) were up-regulated after exposure to MMA. In this study, we aimed to establish a new system to screen for MMA and other dental materials.
This system may be useful as a new screening method for other dental material developments.
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河野 敬, 武本 真治, 服部 雅之, 吉成 正雄, 河田 英司, 小田 豊
セッションID: PS-06
発行日: 2007年
公開日: 2008/06/25
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フリー
We determined the effect of volume fraction of prefabricated fiber posts in posts (FP/P ratio) on the mechanical properties of endodontic posts. Fracture resistance increased with increase in FP/P under bending stress, but did not increase under tensile stress.
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織田 展輔, 若林 則幸, 鈴木 哲也
セッションID: PS-07
発行日: 2007年
公開日: 2008/06/25
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フリー
A three-dimentional finite element models of straight wire gold and Co-Cr alloy clasps were created and bended to angle of 90˚ or 120˚. Thereafter these models deflected 0.25 mm, 0.50 mm, and 0.75mm at the tip. Residual stress and permanent deformation were compared.
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Hidekazu Takahashi, R Kurokawa, WJ Finger
セッションID: O-001
発行日: 2007年
公開日: 2008/06/25
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フリー
The aim of this in vitro trial was to develop a tree-dimensional sulcus model and to determine effects of hydrophilicity and sulcus width on the sulcus depth reproduction with vinyl polysiloxane impression materials.
Regarding single-phase impressions, significant differences were found for sulcus width, 200um > 100um > 50um. Hydrophilicity and their interaction had no significant effect. For double-mix impressions, significant differences were found for hydrophilicity (hydrophilicity > hydrophobic), sulcus width (200um > 100um > 50um), and their interaction.
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Werner J. Finger, Ria Kurokawa, Marcus Hoffmann, Tatsuo Endo, Masafumi ...
セッションID: O-002
発行日: 2007年
公開日: 2008/06/25
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フリー
In this laboratory study interactions between self-etch adhesives and resin composites were investigated. Bond strength is not correlated with marginal adaptation of composites in dentin cavities. Polymerization shrinkage and contraction stress of resin composites were important determinants of marginal adaptation.
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Jina Je, Doug-Youn Lee, Kyoung-Nam Kim, Yong-Keun Lee, Kwang-Mahn Kim
セッションID: O-003
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction:
The success of endodontic treatment is negatively influenced by the presence of microorganisms within the root canal system. Chlorhexidine (CHX) is an antimicrobial agent under investigation as an endodontic irrigant. CHX possesses broad-spectrum antibacterial activity, biocompatibility with periodontal tissues. When CHX is used as a root canal irrigant, the antimicrobial effect is short-lived. For the long-term antimicrobial effect, the root canal system must be exposed to CHX for a longer time than that afforded by irrigation. The aim of this study was to evaluate the effect of polymer coating on the sustained release of CHX from the CHX-loaded absorbent point.
Materials and Methods:
Absorbent paper points were loaded with CHX of 20 % (w/v) by immersing and drying method. In PMMA group, the loaded absorbent points were coated 3 times with 10 % PMMA (polymethyl methacrylate) and in PBMA group, those were coated 3 times with 10 % PBMA (poly n-butylmethacrylate). The surfaces of coated absorbent points were observed by Scanning Electron Microscope (SEM). And each coated absorbent point was immersed in distilled water of 1 mL for 1, 2, 4, 8, 16, 24, 48, 72, and 96 hrs. UV absorbance at 256 nm was measured using a UV spectrophotometer to determine the concentration of released CHX.
Results and Discussion:
The result of SEM showed pores on the surface of both PBMA and PMMA groups. The pores of PBMA group were larger than those of PMMA group. Therefore, the release rate of CHX in PBMA group was higher than in PMMA group before 4 hrs. For the PMMA group, CHX was quickly released between 4 hrs and 8 hrs. Nevertheless, both of them showed sustained release of CHX, which continued for 72 hrs.
Conclusions:
The release rate of CHX from the dental absorbent paper point could be controlled by coating it with polymer. It was concluded that the dental absorbent point coated with PBMA was more effective than PMMA.
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Andrea Viviana Kaneshiro, Satoshi Imazato, Emine Suzan Eneren, Yukiter ...
セッションID: O-004
発行日: 2007年
公開日: 2008/06/25
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フリー
This study evaluated the physical and bonding properties of new surface-coating resins incorporating an antibacterial monomer MDPB (1, 5, 10 or 15 %) to be used for prevention of root surface caries. Although hardness was reduced by the addition of MDPB, abrasive wear of the experimental resins by toothbrushing was considered minimal. The incorporation of MDPB did not adversely affect the bonding ability to cervical dentin. These results suggest that the MDPB-containing coating resins tested are promising for protecting exposed root surfaces from caries for long period.
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Gayani .P. Kanchana Waidyasekera, Nikaido Toru, Dinesh Surangith Weera ...
セッションID: O-005
発行日: 2007年
公開日: 2008/06/25
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フリー
Aesthetic restorations have a great demand as a treatment of dentin exposure in fluorosed teeth. This laboratory study shows the bonding efficacy of Clearfil SE Bond, Clearfil Tri-S Bond and Single Bond to fluorosed dentin.
Human molars were categorized with Thylstrup-fejerskov Index and bonding dentin interfaces were created for microtensile bond testing, field emission scanning electron microscopic morphological analysis.
Clearfil SE Bond showed the best bonding performance to fluorosed dentin out of the three bonding materials. Different dentin bonding interface and surface morphologies were observed with each bonding system.
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ShengHua Wei, Y Shimada, J Tagami
セッションID: O-006
発行日: 2007年
公開日: 2008/06/25
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フリー
In last decade, the two-step self-etching adhesive technology led to the development of all-in-one systems. All-in-one systems are undoubtedly the most user-friendly adhesives, but have been associated with lower effectiveness as compared to two-step self-etching adhesives. It has been reported that the double-application of some all-in-one bonding systems were successful to increase the bond strength to sound dentin. The purpose of this study was to examine the adhesion of two type experimental self-etching adhesives to enamel and dentin and to evaluate the effect of double-application of three all-in-one adhesives on bond strength.
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Juni Handajani -, YKE Arianto, Kota K, Hoshino E
セッションID: O-007
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction:
Cervical sealing should be an important factor for good outcomes of Class II resin restoration. At cervical areas, dentinal tubules run horizontally, meaning that open dentinal tubules may easily remain and cause leakages, and, in addition, margins may locate on cementum. Thus, tight sealing is sometimes not so easy at cervical margin areas. Because shrinkage of cured composite resin (CR) is the main cause of microleakages, the thin layer of resin cement for resin inlay may cause less microleakage. It is shown that saliva disturbs the adhesion of resin. The aim of this study was to evaluate the cervical margin microleakage of resin cement layers of class II CR inlay restorations with and without saliva contamination.
Materials and Methods:
Crown portions of 20 extracted teeth were cut off at near enamel-cementum junction to simulate cervical margins of Class II. Panavia F2.0 and Linkmax resin cements were used to cement with Clearfil AP-X CR resin bodies according to the manufacturer's recommendations with and without saliva contamination (a total of four groups: n=5 each), after the cut surfaces were irrigated with 12% EDTA pH 7.0. After dipped in 0.5 mg/ml safranin-O/ propylene glycol for 24 hours at 37degree Celcius, the sample teeth were cut into two pieces in mesio-distal plan, and dye penetration was evaluated using a stereomicroscope (Nikon, Japan).
Results and Discussion:
No cases using Panavia and Linkmax were observed to have dye penetration unless saliva contaminated. However, saliva affected the tight sealing, because 3 teeth out 5 had leakages when intentional saliva contamination was given at the time adhesion, indicating resin inlays with resin cement would give good sealing even at the cervical margins. More considerations may be needed for actual practice under clinical conditions.
Conclusions:
Tight sealing, even at cervical margin areas of class II restoration using resin inlay cemented by resin cement, could be obtained.
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Young-Il Oh, Doug-Youn Lee, Kwang-Mahn Kim, Kyoung-Nam Kim
セッションID: O-008
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction:
Calcium phosphate cements (CPC) are used as in surgery or dentistry for bone filling materials. In this study, brushite cement was selected because they are resorbable in physiological conditions. Although brushite cement which was one of CPC is viewed as a promising bone substitute material, their setting time and mechanical resistance is too fast and weak to allow their application. It has been demonstrated that mechanical properties of CPC can be modulated through variation in powder composition, liquid phase, liquid-to-powder (L/P) ratio, ageing condition, and many organic or polymeric additives. More recently, a series of studies showed that the incorporation of water-soluble fiber into CPC substantially increased strength and fracture resistance. Therefore, the aim of this study was investigated the effect of addition of dextrin dispersion on the physical and mechanical properties of brushite cement as a function of L/P ratios.
Materials and Methods:
Brushite cement was formulated with an equimolar powder mixture of b-tricalcium phosphate (b-TCP) and monocalcium phosphate monohydrate (MCPM) and liquid phase with 0.5M citric acid (CA). Brushite-dextrin composite cements were prepared with 40wt% dextrin dispersion in 0.5M CA aqueous solution. The composite cements were prepared by as a function of three different L/P ratios (0.4, 0.45, and 0.5). The initial and final setting times of cements were determined using the Gilmore needle technique (1/4 lb and 1 lb). Samples for compression testing were prepared by placing manipulated cement slurry into a PTFE mold of diameter 6mm and height 12 mm. Once set, dry compressive strength of samples was measured after the set at room temperature in the air for 24h. On the other hand, wet compressive strength samples were measured after the storage at 37 C and 100% relative humidity in water bath for a period of 24 h. Compressive strength was tested by UTM.
Results and Discussion:
The setting time of brushite cement without dextrin was about 10min at 0.3 of L/P ratio. The setting time of brushite-dextrin composite cement was increased from 7 to 12min when three different L/P ratios (0.4, 0.45, and 0.5). The L/P ratio of 0.45 was chosen for comparison of mechanical properties in this study. Dry and wet compressive strengths of brushite-dextrin composite cements (13 MPa and 4 MPa) were higher than those of brushite cement without dextrin (7 MPa and 1 MPa). Also, the work-of-fracture of composite cement (208 J and 20 J) was more significantly improved than that of brushite cement without dextrin(106 J and 6 J).
Conclusions:
Although L/P ratio was increased, the mechanical strength of brushite-dextrin composite cement was more improved than brushite cement without dextrin in both dry and wet condition. This study demonstrated that brushite-dextrin composite cement had acceptable mechanical strengths for clinical applications under an appropriate setting time.
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Piyanart Ekworapoj, SK Sidhu, JF MacCabe
セッションID: O-010
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction:
Dental lasers for cavity preparation have been in existence since the 1960s. The erbium laser such as Er:YAG and Er,Cr:YSGG are commonly used for cavity preparation as alternative methods instead of using the high speed hand piece. Many investigations have focused on the bond strength of composite resin and adhesive systems to dentin prepared by these laser systems. There are a few reports about the bond strength of glass ionomer cement to laser prepared dentin. The purpose of this study is to determine the microtensile bond strength of three different types of glass ionomer cements to Er,Cr:YSGG
laser prepared dentin.
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淺岡 憲三
セッションID: O-011
発行日: 2007年
公開日: 2008/06/25
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フリー
Fatigue tests and delayed fracture tests under sustained tensile loading of titanium were carried out. From these results, it was concluded that stress-corrosion cracking related with hydrogen was suspected for delayed fracture of small titanium devices in vivo.
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Pavinee Padipatvuthikul, Lawrence Mair
セッションID: O-012
発行日: 2007年
公開日: 2008/06/25
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フリー
Comparison of Shear Strength, Fatigue-Limit, and Fatigue-Life in Metal/Enamel Bonds. *PADIPATVUTHIKUL P, MAIR LH. (University of Liverpool, School of Dental Studies, UK)
Objectives: To compare the Shear Bond Srength (SBS) of resin-bonded metal/enamel bonds with the Fatigue-Limit and Fatigue-Life of identical joints.
Materials and Methods: 285 discs of Ni/Cr-alloy(dia 5mm*4mm) were cast and treated by either (1)Sandblasting with aluminium oxide or (2)Sandblast + 15 min electrolytic-etch in HCl. The discs were bonded to etched enamel (37% HPO4/30 sec) using 3 bonding systems. Ten discs of each group were subjected to Shear test in a Universal Testing Machine5 (CHS= 50mm/min). Fifteen discs of each group were subjected to a Staircase Fatigue-Test using 5000 cycles, load increment = 4 kg. Another 10 discs were subjected to cyclic loads of 20, 10, and 5 kg to determine Fatigue-Life of the bonds. Load data was compared by correlation analysis and cycle data by Weibull statistic to determine the beta and alpha coefficients for the 3 loads.
Results and Conclusions: The Fatigue-Limit of the bonds was much lower than the Shear strength and there was no correlation between the two values. Fatigue-Limit was not a good predictor of the Fatigue-Life in this study.
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白石 孝信, Johnson Anthony, 篠崎 信也, 久恒 邦博
セッションID: O-013
発行日: 2007年
公開日: 2008/06/25
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フリー
The effects of oxide-forming elements, In, Fe, Sn, Zn, on color variations of the oxidized Pd-free Au-Pt-based high noble dental alloys for porcelain veneering were investigated by means of spectrophotometric colorimetry and thin-film X-ray diffraction technique. Activity of high temperature oxidation was strongly dependent on the base metal elements included. The most active oxide-forming element was Zn, followed by Sn, In, and Fe. From the viewpoint of color stability of the oxidized Au-Pt-based high noble dental alloys for porcelain veneering, the inclusion of a small amount of In was found to be advantageous.
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河合 達志, 桶屋 洋之, 濱島 聡一朗, 佐藤 大和, 谷山 正紀, 鈴木 智雄, 河合 秀樹, 山本 伊一郎
セッションID: O-014
発行日: 2007年
公開日: 2008/06/25
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フリー
骨形成因子は生体内で新生骨誘導するサイトカインとして良く知られている。多くのスキャフォールドが骨形成因子との複合化に使用されており、天然高分子は骨形成因子活性を良好に増強している。本実験においては、数種の高分子をスキャフォールドとして使用した。 実験群は生体内で新生骨
形成を示し、臨床応用への可能性が示された。
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武本 真治, 服部 雅之, 吉成 正雄, 河田 英司, 小田 豊
セッションID: O-015
発行日: 2007年
公開日: 2008/06/25
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フリー
本研究は過酸化水素を含むアルカリ性生理食塩水中での純チタンの電気化学的腐食挙動を評価することを目的とした。その結果、過酸化水素含有アルカリ性生理食塩水中で、純チタンは低い自然電極電位、高い不動態保持電流密度を保持していることが明らかになった。したがって、過酸化水素含有アルカリ性生理食塩水中でチタンは腐食する。
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小田 豊, 武本 真治, 服部 雅之, 吉成 正雄, 河田 英司
セッションID: O-016
発行日: 2007年
公開日: 2008/06/25
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フリー
本研究では、様々なpHの過酸化水素含有生理食塩水中でのチタン合金の変色について比較した。pH4では、すべてのチタン合金のΔE*ab値は18以上であり、明らかな変色が認められた。pH5および6でのΔE*ab値はNi-Ti合金を除いてpH4より低い値だった。過酸化水素を含む酸性生理食塩水中においてチタンおよびチタン合金の変色は、過酸化物による酸化によって引き起こされているのかもしれない。
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Hsueh-Chuan Hsu, TY Chiang, SC Wu, HC Lin, WF Ho
セッションID: O-017
発行日: 2007年
公開日: 2008/06/25
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フリー
The aim of this study was to characterize the electrochemical behavior and biocompatibility of pure titanium and a series of experimental Ti-(10-40) wt% Zr alloys.Except Ti-5Cr and Ti-10Cr alloys, the bond strengths of all the other Ti-Cr alloys exceeded the lower limit value in the DIN 13.927 standard for the 3-point bending test (25 MPa). In the Ti-Cr alloys, bond strength tended to increase as the Cr component increased.Under SEM observation, c.p. Ti surface exhibited the least amount of retained porcelain on the metal surface after debonding, and mainly adhesive bond failure. However, more traces of retained porcelain were observed on specimens that contained higher alloying elements, such as Ti-25Cr and Ti-30Cr alloys, attesting to a better mechanical performance.
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佐藤 秀夫, 伴 清治, 山下 大輔
セッションID: O-018
発行日: 2007年
公開日: 2008/06/25
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フリー
The improvement of zirconia have brought the potential to metal free restoration in dental prosthesis. Tetragonal zirconia polycrystals (TZP) was known as high strength and toughened material. This study was intended to evaluate the biaxial and three-point flexure strength of two zirconias and an alumina.
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Mohammad Ali Saghiri, Ali Mohammad Saghiri, Mohsen Aminsobhani, Mehrda ...
セッションID: O-019
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction: The porcelain in the PFM systems is the type of porcelain which is widely used in dentistry. For this reason, efforts have been made in this project to make dental porcelain powder of a metal bonding type.
Material and Method: In order to do so, Vita opaque porcelain powder (Vmk 68 N) with ISO 1995 specifications was used to produce the new powder. First, the Vita opaque porcelain powder was tested and analyzed by using a scanning electron microscope (SEM) and through X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis. After the Vita powder compound had been obtained and after it had been compared with the existing information and tables, a similar powder was made by using domestically-produced raw materials. After different formulas had been prepared in the course of several stages and after the porcelain powder had been made on the basis of the formulas, a sample of each porcelain powder produced underwent various tests following the melting, fritting, grinding, sifting, heating and granulating stages.
Results and discussion: the characteristics of the opaque porcelain powder produced (T1/14) were similar to those of Vita opaque porcelain powder, and its bending strength, opacity, baking temperature, glazing, contraction degree and adhesion to metal were confirmed through different tests.
Conclusion: According to this study, body porcelain was used for PFM system contains different components for creates satiable chrematistics. This material divided in these category. Opacifier, Glass modifier, Color modifier, Thermal Expansion adapter. In this research discussed about each type of these materials and Have close Examination on advantage and disadvantage of them.
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Mohammad Hafiz Uddin, Takuya Matsumoto, Taiji Sohmura
セッションID: O-020
発行日: 2007年
公開日: 2008/06/25
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フリー
Introduction:
Our previous study showed that hydroxyapatite (HAp) synthesized in the presence of aspartic acid (Asp) changed the morphology and crystallinity of synthesized HAp. FTIR results indicated that Asp was included in the synthesized HAp. However, the mechanism how Asp is uptaken in the HAp is not fully understood. To understand this mechanism, the adsorption/desorption of Asp onto/from HAp particles was examined.
Materials and Methods:
For the adsorption study, 200 mg of HAp powder was mixed with 40 ml of PBS containing Asp (0.05-0.25 mol/l) by stirring for 2 h at a controlled pH 7.4 at 80
0C. For the desorption study, 10 mg of HAp powder synthesized in the presence of Asp (HAp-Asp, 0.05-0.5 mol/l) was mixed with 10 ml of PBS or 5-20 mmol/l NaCl dissolved PBS by 1 h stirring. In both the adsorption and the desorption study, Asp in the supernatant liquid was collected and measured by UV-VIS spectrophotometer. FTIR analysis of precipitated particles was also performed to confirm the adsorption/desorption of Asp onto/from HAp.
Results and Discussion:
Adsorption study showed that adsorbed amount of Asp onto normal HAp increased linearly with increase of Asp concentration (0.05-0.25 mol/l) in the solution. FTIR data of precipitated particles confirmed the adsorption of Asp onto normal HAp. To understand whether Asp in HAp-Asp is either a simple adsorption or not, we evaluated the desorption of Asp from HAp-Asp. If it is a simple Asp adsorption onto HAp, Asp release from HAp-Asp would be possible by altering the ionic strength of solutions. However, different ionic strength (NaCl, 5-20 mmol/l) dissolved in PBS did not enhance the desorption of Asp from HAp-Asp (0.05-0.5 mol/l). Therefore, it might be considered that Asp in HAp-Asp is physically packed in the apatite structure so that it cannot be released from HAp-Asp.
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テレウハン イリヌラ, 平田 伊佐雄, 岡崎 正之
セッションID: O-021
発行日: 2007年
公開日: 2008/06/25
会議録・要旨集
フリー
To develop a new biodegradable scaffold biomaterial reinforced with a frame, CO
3Ap, which has crystallinity and a chemical composition similar to bone, was synthesized at pH 7.4 and 60 C. Then, the CO
3Ap was mixed with a neutralized collagen gel and the CO
3Ap-collagen mixtures were lyophilized into sponges in a HAp frame ring with 0.5 mm pores. Mouse osteoblast MC3T3-E1 cells were cultured on the CO
3Ap-collagen sponge. Furthermore, these sponge-frame complexes were implanted beneath the periosteum cranii of rats. A sectional view of hematoxylin-eosin staining confirmed that osteoblast cells had well invaded the CO
3Ap-collagen sponge. At the animal experiment, newly created bone was observed toward the inner core of the complex from the surface of the rat periosteum cranii after 8 wks. When these sponge-frame complexes with rh-BMP2 were implanted beneath the periosteum cranii of rats, sufficient new bone was created after 4 wks implantation.
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Naomi Izutani, Satoshi Imazato, Yusuke Takahashi, Shigeyuki Ebisu, Roy ...
セッションID: O-022
発行日: 2007年
公開日: 2008/06/25
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フリー
In this study, the viability of Streptococcus mutans planktonic and biofilm cells after exposure to antibacterial monomer MDPB for a short period was assessed. The results indicate that unpolymerized MDPB at 1000 µg/mL (8 times the MBC) was effective to kill S. mutans in suspension and biofilm within 60 sec, suggesting its effectiveness for cavity disinfection under clinical situation.
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Tatsuhide Hayashi, Tatsushi Kawai, Takafumi Asai, Masashi Okano, Yamat ...
セッションID: O-023
発行日: 2007年
公開日: 2008/06/25
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フリー
In recent experiments, we have tried to induce the formation of bone from immature muscular tissue
in vitro using BMP as a source of cytokine, and e-PTFE as a scaffold. To promote differentiation to the bone-like tissue, the influence of the Ca
2+ was examined in this experiment. It was found that the addition of the Ca standard solution to the medium is very effective for this model of tissue engineering.
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吉田 靖弘, 田中 力, 窪木 拓男, 鈴木 一臣, 伊藤 嘉浩
セッションID: O-024
発行日: 2007年
公開日: 2008/06/25
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The aim of this study was to evaluate the effect of treating Ti with phosphorylated pullulan or photo-reactive gelatin on the cell attachment and proliferation. Adsorption of phosphorylated pullulan significantly accelerated cell proliferation. It was found that the growth of cells on titanium could be regulated by pattern-immobilized gelatin. These facts indicate that these materials can be used to fabricate bioactive Ti implants.
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鈴木 祐子, 鎌倉 慎治, 羽鳥 弘毅, 佐々木 和夫, 本田 義知, 穴田 貴久, 佐々木 啓一, 鈴木 治
セッションID: O-025
発行日: 2007年
公開日: 2008/06/25
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フリー
Previous studies showed that octacalcium phosphate (OCP) combined with collagen (OCP/Col) enhances bone regeneration in bone defect. In the present study, OCP/Col disc (1 mm or 3 mm in thickness) were implanted into the periosteal region in rat crania to investigate the bone regenerative properties of OCP/Col. The maximum thickness of the bone with implant was measured parallel to the calvaria. The histological sections were cut and activities of tartrate resistant acid phosphatase (TRAP) were stained to examine phagocytotic multinucleated giant cells. The effect of implantation on crystalline phase of OCP in the implant was examined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The present study suggests that new bone formation on OCP/Col and biodegradation of OCP/Col are depending on the thickness of OCP/Col.
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片岡 有, 小瀬 麻起子, 柴田 陽, 宮崎 隆
セッションID: O-026
発行日: 2007年
公開日: 2008/06/25
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フリー
The authors have demonstrated that wire-type electric discharge machining (W-EDM) of titanium (W) allowed a microstructured surface with an irregular morphology as well as thicker oxide layer. Additionaly, those surface characteristics have favorable scaffold prperties for osteoblastic cells. (2005, IADR, Boltimore). Thus, this study aimed to investigate the bone regenerative potential of rat mesenchymal stem cell (RMSC) cultured on W-EDM.
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Nina Djustiana
セッションID: O-027
発行日: 2007年
公開日: 2008/06/25
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武井 由紀子
セッションID: O-028
発行日: 2007年
公開日: 2008/06/25
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フリー
It was examined the inherent changes in mouse osteoblastic cells (MC3T3-E1 cell) placed on two different sintered surfaces: rutile and anatase TiO2, by ALP staining. Anatase TiO2 materials, when heated to high sintering temperatures, become rutile. Anatase TiO2 specimens sintered at low temperatures, anatase crystal phase remained, did not under do this change and resulted in a negative ALP staining, high temperatures, which turned to rutile phase, change resulted in a positive ALP staining.
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Michael F Burrow, Martin J Tyas
セッションID: O-029
発行日: 2007年
公開日: 2008/06/25
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Few data exist with respect to the clinical performance of all-in-one adhesive systems., The aim of this study was to evaluate the retention and marginal staining of resin composite restorations bonded with Clearfil S3 Bond or G-Bond all-in-one systems placed in noncarious cervical lesions. Sixty restorations were placed in 11 subjects, mean age 62.5 years. Restorations were bonded and placed according to the manufacturers? instructions. No enamel etching was performed on the enamel margins prior to restoration placement. Patients were recalled at 6 months, and 1year, with all restorations being able to be evaluated for presence and marginal staining. All restorations were present. Slight marginal staining was observed on 4 restorations for S3 and 3 restorations for G-Bond. The early results of this clinical evaluation are showing good outcomes at this stage for both materials
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Arzu Atay, Gunay Yumushan, Banu Karayazgan, Selcuk Oruc
セッションID: O-030
発行日: 2007年
公開日: 2008/06/25
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フリー
INTRODUCTION: Oral candidiosis is the most common fungal infection encountered in dentistry.
PURPOSE: The purpose of this study was to investigate quantitively adhesion of Candida albicans to different maxillofacial silicone materials in RPMI 1640. The quantitively measurement was provided by use of a colorimetric method (XTT).
RESULT: There was adhesion on the maxillofacial silicone materials. However there was no measured differences among materials. (p>0.01).
CONCLUSION: This finding emphasizes that C. albicans adhere to maxillofacial silicone materials
Key Words: C. albicans, Adhesion.
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坪田 圭司, 渡邊 孝行, 森 健太郎, 山本 明, 浅賀 庸平, 黒川 弘康, 安藤 進, 宮崎 真至
セッションID: P-001
発行日: 2007年
公開日: 2008/06/25
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フリー
シングルステップ接着システムに対する酸を用いた前処理がエナメル質接着耐久性に及ぼす影響について,剪断断接着強さ試験,試験後の破断面の観察,電子顕微鏡による処理面および接合界面の観察を行って検討した。
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陸田 明智, 千葉 康史, 色川 敦士, 安田 源沢, 山口 佳奈子, 渡邉 珠代, 高見澤 俊樹, 宮崎 真至
セッションID: P-002
発行日: 2007年
公開日: 2008/06/25
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フリー
象牙質の酸蝕を想定して,人工脱灰液で脱灰したウシ歯象牙質に,市販シングルステップ接着システム5製品を用いて,その象牙質接着性を剪断接着強さ試験,破断面の観察および走査電子顕微鏡観察を行うことによって検討した。
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Danuchit Banomyong, Joseph E.A. Palamara, Michael F. Burrow, Harold H. ...
セッションID: P-003
発行日: 2007年
公開日: 2008/06/25
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The aims of this study were to compare fluid flow rates across dentine surfaces treated with four conditioners, and the effect of conditioning and dentine permeability on micro-shear bond strengths of glass ionomer cement and resin-based adhesives.
Under a simulated pressure of 1.3 kPa, two dentine conditioners (Dentin Conditioner and Cavity Conditioner), 37% phosphoric acid (Acid Etch Gel) and a self-etching primer (Clearfil SE Primer) were applied to the dentine surfaces. Dentinal fluid flows at baseline and after conditioning were recorded for 15 min each using the Flodec device. The conditioned surfaces were examined using a scanning electron microscope. The micro-shear bond strengths of a glass ionomer cement (Fuji IX GP) bonded to unconditioned and conditioned dentine, or two resin-based adhesives (Single Bond 2 or Clearfil SE Bond) bonded to dentine with simulated intrapulpal pressures of either 0 or 1.3 kPa were evaluated.
Only the dentine surface etched with phosphoric acid showed a significant increase in dentin permeability. SEM images of dentine etched with Acid Etch Gel showed the smear layer and plugs were completely removed. In contrast, smear plugs in dentinal tubules were partially removed by the other conditioners. There was no significant difference in micro-shear bond strengths of Fuji IX GP between unconditioned and conditioned dentine with either conditioner, regardless of the simulated pulpal pressure (p>0.05). Effects on bond strengths of resin-based adhesives depended on the system used. The simulated positive intrapulpal pressure during bonding significantly affected the adherence of Single Bond 2 (p<0.0001), however, Clearfil SE Bond was not affected (p>0.05).
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陳 克恭, 寺下 正道
セッションID: P-004
発行日: 2007年
公開日: 2008/06/25
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フリー
A phosphonic acid monomer-containing tooth make-up system developed for masking the tooth discoloration for a transient period bonded to enamel or dentin at least 40% the microtensile tensile bond strength of phosphoric acid etched enamel with little damage to enamel after thermocycling.
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Sarah Louise Rolland, J MaCabe, A Walls, M German
セッションID: P-005
発行日: 2007年
公開日: 2008/06/25
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フリー
Dentistry is becoming more conservative and bonding to demineralised dentine affected by caries is considered acceptable. Hybrid layers in demineralised dentine are thicker, and
dentine bonding agents may not be able to cure completely at the depth of the lesion.
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鎗水 秀樹, H Tokui, H Nakaseko, T Sakuma
セッションID: P-006
発行日: 2007年
公開日: 2008/06/25
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フリー
レジン強化型グラスアイオノマーセメントは、合着用セメントとして広く使用されている。アルミナやジルコニアのような高強度セラミックの発達につれて、より高い物性を有する合着セメントが望まれるようになっている。合着セメントの物性向上のため、セメントの骨格を形成するモノマーと共重合可能な酸モノマーの導入を検討した。モノマー間の共重合は、酸モノマーとガラスフィラーとの間のイオン結合に加え、セメントマトリックスを強化することが可能である。本研究ではジルコニア合着における、合着セメント自体の強度の影響を評価した。
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